JPH02116B2 - - Google Patents
Info
- Publication number
- JPH02116B2 JPH02116B2 JP18441881A JP18441881A JPH02116B2 JP H02116 B2 JPH02116 B2 JP H02116B2 JP 18441881 A JP18441881 A JP 18441881A JP 18441881 A JP18441881 A JP 18441881A JP H02116 B2 JPH02116 B2 JP H02116B2
- Authority
- JP
- Japan
- Prior art keywords
- phosphorus
- tank
- rotating disk
- anaerobic
- submerged
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052698 phosphorus Inorganic materials 0.000 claims description 64
- 239000011574 phosphorus Substances 0.000 claims description 64
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000010802 sludge Substances 0.000 claims description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 239000002351 wastewater Substances 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 239000005416 organic matter Substances 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 11
- 238000005345 coagulation Methods 0.000 claims description 7
- 230000015271 coagulation Effects 0.000 claims description 7
- 238000004062 sedimentation Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 238000004065 wastewater treatment Methods 0.000 claims 2
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 26
- 239000007788 liquid Substances 0.000 description 24
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 159000000014 iron salts Chemical class 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 150000003018 phosphorus compounds Chemical class 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- -1 phosphorus compound Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Description
【発明の詳細な説明】
本発明は下水、し尿、各種産業廃水中に含まれ
るリン及び窒素を回転円板法を利用して除去する
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for removing phosphorus and nitrogen contained in sewage, human waste, and various industrial wastewater using a rotating disk method.
廃水中のリンの除去方法としては、従来から活
性汚泥プロセス中において、アルミニウム塩、鉄
塩あるいは石灰などを添加し、廃水中のリンを化
学的に沈殿する方法と三次処理として同様の薬品
によつて凝集沈殿する方法が主として行われてい
る。これらの方法は薬品を使用するため、そのコ
ストが高くなること、また汚泥の発生量が多いた
め、汚泥処理に要するコストも膨大になる欠点が
ある。そこで生物学的なリンの除去方法が提唱さ
れている。この方法は、活性汚泥プロセスにおい
て廃水中のリンを好気微生物を摂取させて除去す
るとともに、摂取したリンを嫌気条件の下で少流
量の流れの中に放出せしめ、これに石灰を少量添
加し、リンを沈殿除去しようとするものである。
この方法によれば従来では廃水の全量に対して凝
集沈殿用の薬品を添加する必要があつたのに対
し、少量に注入すればよいため薬品の使用量を大
巾に低減することができる。また発生する汚泥の
量も減少するため、汚泥処理に要するコストも同
時に低減することができる利点がある。 Conventional methods for removing phosphorus from wastewater include adding aluminum salts, iron salts, or lime during the activated sludge process to chemically precipitate phosphorus from wastewater, and using similar chemicals as tertiary treatment. The most commonly used method is coagulation and precipitation. These methods have drawbacks such as high costs due to the use of chemicals, and high costs for sludge treatment due to the large amount of sludge generated. Therefore, biological methods for removing phosphorus have been proposed. This method removes phosphorus from wastewater in an activated sludge process by ingesting aerobic microorganisms, and releases the ingested phosphorus into a stream under anaerobic conditions at a low flow rate, to which a small amount of lime is added. , which attempts to remove phosphorus by precipitation.
According to this method, whereas in the past it was necessary to add chemicals for coagulation and precipitation to the entire amount of wastewater, it is only necessary to inject a small amount of the wastewater, so the amount of chemicals used can be greatly reduced. Furthermore, since the amount of sludge generated is reduced, there is an advantage that the cost required for sludge treatment can be reduced at the same time.
この方法は、活性汚泥プロセスにおいて、ある
好気条件における微生物は、通常の増殖に必要な
量以上のリンを過剰に摂取し、逆に嫌気条件下で
は、一度摂取したリンを放出する現象を利用した
もので、廃水中のリンを活性汚泥を利用して、濃
縮し薬品によつて沈殿除去するものである。 This method takes advantage of the phenomenon in the activated sludge process that under certain aerobic conditions, microorganisms ingest an excess of phosphorus beyond what is required for normal growth, and conversely, under anaerobic conditions, they release the phosphorus they have already taken in. This method uses activated sludge to concentrate phosphorus in wastewater and removes it by precipitation with chemicals.
リンを活性汚泥で除去するためには、処理に関
与する汚泥が好気、嫌気の環境をくり返し経るこ
とが必要条件となる。すなわちある期間嫌気的で
飢餓状態におかれた活性汚泥はリンの溶出現象を
起し、周囲の液中にリンを放出する。しかしこの
汚泥を好気的条件にし、リンを与えると逆に一般
の摂取量よりも過剰のリンを体内に取り込み始め
る。回転円板法では大部分の活性汚泥は円板体に
固着しているため、活性汚泥法のように活性汚泥
を好気槽と嫌気槽の間を循環させることができな
い。そこで本発明では同一槽において好気、嫌気
の状態を交互にくり返し、リンの過剰摂取と放出
現象を起こすようにしたものである。 In order to remove phosphorus with activated sludge, it is necessary that the sludge involved in the treatment undergo repeated aerobic and anaerobic environments. In other words, activated sludge that is kept in an anaerobic starvation state for a certain period of time undergoes a phosphorus elution phenomenon and releases phosphorus into the surrounding liquid. However, when this sludge is brought under aerobic conditions and phosphorus is supplied, the sludge begins to absorb more phosphorus into its body than is normally ingested. In the rotating disk method, most of the activated sludge is stuck to the disk body, so activated sludge cannot be circulated between the aerobic tank and the anaerobic tank as in the activated sludge method. Therefore, in the present invention, aerobic and anaerobic conditions are alternately repeated in the same tank to cause excessive intake and release of phosphorus.
本発明は以上の点に鑑みてなされたものであつ
て、生物学的リン除去法の利点を生かし、さらに
回転円板法の利点も加えて、より効率的に廃水中
のリンを除去しようとするものである。すなわち
複数の回転円板装置において槽内の水位を回転円
板体が全水没するまで上昇させることができる構
造とし、この水位の上下によつて好気嫌気運転を
くり返し行い、さらに上記の好気嫌気運転を異な
る回転円板槽で常に並行して行わせるものとし
て、連続的に廃水中のリンを除去するものであ
る。回転円板槽は槽内水位を回転円板体が全水没
するまで上昇させた状態で運転を行うと、回転円
板の回転は槽内液の撹拌を行うだけで大気と槽内
液との接触がないため槽内は嫌気性の雰囲気が維
持される。一方槽内の水位を回転円板体の一部が
水没する状態で運転すると回転円板の回転によつ
て槽内液の撹拌と大気との接触が活発に行われる
ために槽内は好気的な雰囲気が保たれる。従つて
同一の回転円板槽において槽内の水位を変化させ
ることで、好気及び嫌気の交互運転が可能とな
る。上記のような運転は回分式となるため、連続
的な処理を行うために、複数の回転円板装置を設
置し、常に並行して好気嫌気運転を行うこととし
た。以上のような工夫を施すことによつて回転円
板法を利用して生物学的に廃水中のリンを濃縮す
ることが可能となり、従来法に比して、より安価
な運転コストでリンの除去を行うことができる。
また本装置内で好気と嫌気の回転円板槽が存在す
るため、リンを除去すると同時に廃水中の窒素の
硝化、脱窒反応も遂行することができ、一部の窒
素の除去も可能となる。 The present invention has been made in view of the above points, and aims to more efficiently remove phosphorus from wastewater by taking advantage of the biological phosphorus removal method and adding the advantages of the rotating disk method. It is something to do. In other words, the structure is such that the water level in the tank can be raised in a plurality of rotating disk devices until the rotating disk bodies are completely submerged, and aerobic and anaerobic operation is repeated by raising and lowering the water level, and then the above-mentioned aerobic operation is performed. Anaerobic operation is always performed in parallel in different rotating disk tanks to continuously remove phosphorus from wastewater. If a rotating disk tank is operated with the water level in the tank raised until the rotating disk body is completely submerged in water, the rotation of the rotating disk will only stir the liquid in the tank and will reduce the interaction between the atmosphere and the liquid in the tank. Since there is no contact, an anaerobic atmosphere is maintained inside the tank. On the other hand, if the tank is operated with the water level in the tank partially submerged, the rotation of the rotating disc will actively agitate the tank liquid and bring it into contact with the atmosphere, creating an aerobic atmosphere inside the tank. The atmosphere is maintained. Therefore, by changing the water level in the same rotating disk tank, alternating aerobic and anaerobic operation is possible. Since the above-mentioned operation is a batch type, in order to perform continuous processing, it was decided to install a plurality of rotating disk devices and always perform aerobic and anaerobic operation in parallel. By implementing the above-mentioned measures, it has become possible to biologically concentrate phosphorus in wastewater using the rotating disk method, and it has become possible to concentrate phosphorus in wastewater at lower operating costs than conventional methods. Removal can be performed.
In addition, since there are aerobic and anaerobic rotating disk tanks within this device, it is possible to simultaneously remove phosphorus and perform nitrification and denitrification reactions of nitrogen in wastewater, making it possible to remove some nitrogen. Become.
次に本発明の詳細を実施例により説明する。第
１図は本装置に使用する回転円板槽の一例であ
る。回転円板体Ｂを槽Ａ内に設置し、駆動装置Ｃ
によつて回転させる。好気的な運動を行う場合は
槽Ａ内の水位をＥの位置に調節する。この位置は
回転円板体の一部が水没する状態であればよいが
円板の全表面が槽内液と接触し、酸素の供給を充
分に保つためには、一般には回転円板体を40〜50
％浸漬させる位置が望ましい。逆に嫌気的な運転
を行う場合は槽Ａ内の水位をＤの位置に上昇さ
せ、回転円板体Ｂを水中に全水没させる。 Next, the details of the present invention will be explained using examples. FIG. 1 shows an example of a rotating disk tank used in this device. The rotating disk body B is installed in the tank A, and the drive device C
Rotate by. When performing aerobic exercise, adjust the water level in tank A to position E. This position only needs to be such that a part of the rotating disk is submerged in water, but in order to ensure that the entire surface of the disk is in contact with the liquid in the tank and to maintain a sufficient supply of oxygen, generally the rotating disk is 40-50
% immersion position is desirable. Conversely, when performing anaerobic operation, the water level in tank A is raised to position D, and rotating disk body B is completely submerged in water.
これらの水位の変動は槽壁に設けた流出管ある
いは流入管の弁の開閉操作によつて行う。流入液
は連続的に流れて居るのでバルブの操作に依つて
嫌気性槽を全水没させる事が出来る。 These water level fluctuations are performed by opening and closing valves on the outflow pipe or inflow pipe provided on the tank wall. Since the inflow liquid flows continuously, the anaerobic tank can be completely submerged by operating the valve.
第２図及び第３図は本発明のフロー例の１例で
ある。まず第２図に示すように有機物及びリンを
含んだ廃水は、No.１回転円板槽１に導びかれる。
この槽では槽内の水位を回転円板体の一部が水没
する状態で運転し、好気的な処理が行われる。こ
こで有機物及びリンが除去される。次にこの流出
液は沈殿槽２で固液分離されリンを含まない処理
水として放流される。これと同時に上記流出液の
一部３をNo.２回転円板槽４に導く、この槽は槽内
の水位を回転円板体が全水没する状態で運転し嫌
気的な処理が行われる。このため槽内のリンの少
い液側に固定汚泥膜中のリンが放出される。 FIG. 2 and FIG. 3 are an example of a flow example of the present invention. First, as shown in FIG. 2, wastewater containing organic matter and phosphorus is led to No. 1 rotating disk tank 1.
This tank is operated with the water level in the tank so that a part of the rotating disc body is submerged in water, and aerobic treatment is performed. Organic matter and phosphorus are removed here. Next, this effluent is separated into solid and liquid in a settling tank 2 and discharged as treated water that does not contain phosphorus. At the same time, a portion 3 of the effluent is introduced into the No. 2 rotating disk tank 4. This tank is operated with the water level in the tank so that the rotating disk body is completely submerged in water, and anaerobic treatment is performed. Therefore, phosphorus in the fixed sludge membrane is released to the liquid side with less phosphorus in the tank.
そしてリンを多く含んだ流出液を凝集槽５に導
びき凝集剤を添加する。この液はリン化合物の沈
殿汚泥を含み沈殿槽２に流入し、好気処理された
流出液と混合されて汚泥を分離しリンを含まない
処理水として放流される。この運転を一定時間継
続した後次に第２図に示すフローに運転を切換え
る。すなわち廃水の導入をNo.２回転円板槽４に移
しこの槽の水位を回転円板体の一部が水没する状
態まで下げて、好気性運転に切換える。この槽で
は活性汚泥が前記の運転で嫌気性に維持されてい
たため、リンの放出が行われており、有機物とリ
ンを含む廃水が流入し好気的な雰囲気に変換する
と、有機物を除去すると同時に過剰にリンを摂取
することになる。この処理液は沈殿槽２に移され
固液分離されて放流される。またNo.１回転円板槽
１にはこの処理液の一部６が除々に導入されて槽
内の水位が上昇し、回転円板体が全水没する位置
で止める。この状態で自動的に槽内は嫌気的な運
転に移行していく。ここで好気状態時に過剰に摂
取された活性汚泥中のリンはほとんどが液側に放
出される。この放出液は凝集槽５に導かれ、凝集
剤が添加されて沈殿槽２に流入し、ここでリン化
合物は汚泥と共に沈降分離され、好気処理された
水と共に放流される。本方式は以上の運転を切換
えてくり返して行うことにより連続的に廃水中の
有機物とリンを除去する。 Then, the effluent containing a large amount of phosphorus is led to a coagulation tank 5, and a coagulant is added thereto. This liquid contains precipitated sludge containing phosphorus compounds, flows into the settling tank 2, is mixed with the aerobically treated effluent, the sludge is separated, and is discharged as treated water that does not contain phosphorus. After continuing this operation for a certain period of time, the operation is then switched to the flow shown in FIG. That is, the introduction of waste water is transferred to the No. 2 rotating disk tank 4, the water level of this tank is lowered to a state where a part of the rotating disk body is submerged, and the operation is switched to aerobic operation. In this tank, the activated sludge was maintained in an anaerobic state during the above operation, so phosphorus was released.When wastewater containing organic matter and phosphorus entered the tank and converted to an aerobic atmosphere, organic matter was removed and at the same time You will be ingesting too much phosphorus. This treated liquid is transferred to the settling tank 2, separated into solid and liquid, and discharged. Further, a portion 6 of this processing liquid is gradually introduced into the No. 1 rotating disk tank 1, the water level in the tank rises, and it stops at a position where the rotating disk body is completely submerged. In this state, the inside of the tank automatically shifts to anaerobic operation. Here, most of the phosphorus in the activated sludge that is ingested in excess during aerobic conditions is released to the liquid side. This discharged liquid is led to a coagulation tank 5, a coagulant is added thereto, and flows into a settling tank 2, where the phosphorus compound is separated by sedimentation together with the sludge, and is discharged together with the aerobically treated water. This method continuously removes organic matter and phosphorus from wastewater by switching and repeating the above operations.
次に窒素を含む廃水に対しても本方式を適用す
ることでリンと同時に一部の窒素を除去すること
ができる。すなわち、窒素を含む廃水は、好気性
槽で有機物とリンが除去されると同時に硝化反応
が起り、有機性窒素、アンモニア性窒素は亜硝
酸、硝酸に酸化される。 Next, by applying this method to wastewater containing nitrogen, it is possible to remove some nitrogen at the same time as phosphorus. That is, in wastewater containing nitrogen, organic matter and phosphorus are removed in an aerobic tank, and at the same time a nitrification reaction occurs, and organic nitrogen and ammonia nitrogen are oxidized to nitrous acid and nitric acid.
この液は沈殿槽に移つて固液分離され放流され
るが一部は嫌気性槽に導びかれる。ここでリンの
放出と共に亜硝酸、硝酸は脱窒菌の働きによつて
脱窒される。この場合、有機炭素源としてメタノ
ールなどが添加される。この結果嫌気性槽の流出
液は窒素を含まず、リンを多く含むことになる。
これに凝集槽で薬品を添加し、リンを沈殿させ沈
殿槽に導いて放流する。従つて嫌気性槽に通液し
た分だけの窒素は完全に除去され、残りの液は有
機性窒素、アンモニア性窒素を含まないことにな
る。廃水中の総窒素の除去率は嫌気性槽に通液し
た量によつて決められる。 This liquid is transferred to a settling tank where it is separated into solid and liquid and discharged, but a portion is led to an anaerobic tank. Here, along with the release of phosphorus, nitrite and nitric acid are denitrified by the action of denitrifying bacteria. In this case, methanol or the like is added as an organic carbon source. As a result, the effluent from the anaerobic tank contains no nitrogen but a large amount of phosphorus.
Chemicals are added to this in a flocculation tank to precipitate phosphorus, which is then led to a sedimentation tank and discharged. Therefore, the nitrogen equivalent to the amount of liquid passed through the anaerobic tank is completely removed, and the remaining liquid does not contain organic nitrogen or ammonia nitrogen. The removal rate of total nitrogen in wastewater is determined by the amount of water passed through the anaerobic tank.
第２図、第３図で示した例ではリンを殿除去す
るために凝集剤を添加した液を、好気性処理した
流出液と混合させて同一の沈殿槽で固液分離して
いるが、別途に凝集沈殿用の沈殿槽を設けても支
障はない。この場合、装置の規模は大きくなるが
リン化合物を含む汚泥を好気生物処理の汚泥から
分離して引き抜くことができる。一方薬品による
凝集汚泥と好気生物処理汚泥を混合して沈殿させ
る場合は、凝集フロツクの影響により固液分離が
より効果的に行われる。凝集剤にはPAC（ポリ塩
化アルミニウム）、硫酸バンド、鉄塩などを使用
するが、廃水中にアルカリ度が不足する場合はア
ルカリ剤の添加が必要である。また石灰を使用す
る場合はPHを10以上に上げるため、石灰添加沈殿
分離後処理水PHの再調整が必要である。回転円板
槽の好気嫌気の運転の切換え時間は嫌気性槽での
活性汚泥膜からのリンの放出速度によつて決めら
れる。下水処理の場合、嫌気雰囲気下での活性汚
泥からのリンの放出は６〜８時間で完遂すること
が知られており、本方式でもこの程度のサイクル
時間ですることが必要である。また嫌気性槽に通
水する量は少量ほど凝集剤の添加量を減少させる
ことができるが、リンの放出速度と液中のリン濃
度との関係、嫌気性運転の時間などによつて決め
られる。窒素の除去を行う場合、好気性槽の滞留
時間は硝化反応が進行するに充分な時間を設定す
る必要がある。同時に嫌気性槽においても脱窒反
応を完遂させるに足る滞留時間を持たせる。嫌気
性槽に通水する量は、大きくなるほど全体の総窒
素除去率は向上する。 In the example shown in Figures 2 and 3, the liquid to which a flocculant has been added to precipitate and remove phosphorus is mixed with the aerobically treated effluent and separated into solid and liquid in the same settling tank. There is no problem even if a separate sedimentation tank for coagulation and sedimentation is provided. In this case, although the scale of the apparatus becomes larger, sludge containing phosphorus compounds can be separated and extracted from the sludge of aerobic biological treatment. On the other hand, when flocculated sludge caused by chemicals and aerobic biologically treated sludge are mixed and precipitated, solid-liquid separation is performed more effectively due to the influence of flocs. PAC (polyaluminum chloride), aluminum sulfate, iron salts, etc. are used as flocculants, but if the wastewater lacks alkalinity, it is necessary to add an alkaline agent. Furthermore, when using lime, the pH of the treated water must be readjusted after lime addition, precipitation and separation to raise the pH to 10 or higher. The switching time between aerobic and anaerobic operation of the rotating disk tank is determined by the rate of release of phosphorus from the activated sludge membrane in the anaerobic tank. In the case of sewage treatment, it is known that the release of phosphorus from activated sludge under an anaerobic atmosphere is completed in 6 to 8 hours, and this method also requires a cycle time of this order. In addition, the amount of water passed through the anaerobic tank can be reduced by reducing the amount of flocculant added, but it is determined by the relationship between the phosphorus release rate and the phosphorus concentration in the liquid, the time of anaerobic operation, etc. . When removing nitrogen, the residence time in the aerobic tank must be set to be sufficient for the nitrification reaction to proceed. At the same time, the anaerobic tank is also provided with a residence time sufficient to complete the denitrification reaction. The larger the amount of water passed through the anaerobic tank, the higher the overall nitrogen removal rate.
回転円板法を利用して廃水中の有機物及びリン
を除去する場合、従来の方式では、まず回転円板
槽において有機物を好気性処理し、次にその処理
液に対して凝集剤を添加しリンを沈殿除去するの
が一般的であり、この方法によると廃水全量に対
して凝集剤を添加する必要があり薬品のコストが
膨大となり、また発生する汚泥量も多く、このた
めの処理、処分のコストも非常に高くなる欠点が
ある。 When using the rotating disk method to remove organic matter and phosphorus from wastewater, the conventional method involves first aerobically treating the organic matter in a rotating disk tank, and then adding a flocculant to the treated solution. Generally, phosphorus is removed by precipitation, but this method requires the addition of a flocculant to the entire amount of wastewater, which increases the cost of chemicals, and also generates a large amount of sludge, which requires treatment and disposal. The disadvantage is that the cost is also very high.
一方これに対し本発明においては、回転円板の
活性汚泥膜によるリンの濃縮作用を利用するた
め、少量の廃水に対して凝集剤を添加すれば良
く、薬品のコストあるいは発生する汚泥の処理処
分コストを大巾に低減することができる。回転円
板槽を追加することによる運転動力の増加は２槽
を並設し駆動装置を共用することにより少くでき
る。また一般の活性汚泥プロセスの脱リン法でで
は、嫌気性リン放出槽での汚泥とリン濃厚液との
分離に苦心が払われているが、本発明では回転円
板槽を利用しているため、常時槽内が撹拌され、
固定活性汚泥膜とリン濃厚液との分離は容易に行
われる。以上のように本発明は、回転円板法の従
来からの特徴である運転管理が容易であること、
運転コストが安価であることなどが生かされ、さ
らに活性汚泥膜のリンの濃縮作用を利用して、従
来法よりより安価な薬品、汚泥処理コストで廃水
中のリン除去あるいは合せて窒素の除去を可能と
したものである。 On the other hand, in the present invention, since the phosphorus concentration effect by the activated sludge membrane of the rotating disk is utilized, it is only necessary to add a flocculant to a small amount of wastewater, which reduces the cost of chemicals and the treatment and disposal of the generated sludge. Costs can be significantly reduced. The increase in operating power due to the addition of a rotating disk tank can be reduced by installing two tanks side by side and sharing a driving device. In addition, in the general dephosphorization method of activated sludge process, painstaking efforts are made to separate sludge and phosphorus concentrated liquid in an anaerobic phosphorus release tank, but in the present invention, a rotating disk tank is used. , the inside of the tank is constantly stirred,
Separation between the fixed activated sludge membrane and the phosphorus concentrate is easily performed. As described above, the present invention has the advantages of easy operation management, which is a conventional feature of the rotating disk method.
Taking advantage of its low operating costs, it also takes advantage of the phosphorus concentration effect of activated sludge membranes to remove phosphorus from wastewater or remove nitrogen at the same time with cheaper chemicals and sludge treatment costs than conventional methods. This made it possible.
尚、以上の記述中回転円板槽に限らず広く回転
接触槽でも同様な事を行うことが出来る。 Incidentally, the above description is not limited to the rotating disk tank, but the same can be done with a wide range of rotating contact tanks.
実施例 １
下水を対象に本方法の実施テストを行つた。回
転円板装置は円板の直径は473mmφ、全有効表面
積は13.5m2、槽容量は好気運転の場合90、嫌気
運転の場合184で円板回転数は13rpm一定とし
た。処理量を60／Ｈとし、このうち半分の30
／Ｈを嫌気槽に循環してその流出液に石灰を添
加する運転において、BOD除去率90％Ｔ−Ｐ除
去率90％以上の結果が得られた。この場合の流入
下水のBODは51〜233mg／Ｔ−Ｐは6.7〜11.0
mg／である。石灰はCaOで約300mg／添加し
たが、これは全処理量の半分量に対して加えたた
め使用量は従来法に比して半分に低減された。Example 1 The method was tested on sewage. In the rotating disk device, the disk diameter was 473 mmφ, the total effective surface area was 13.5 m 2 , the tank capacity was 90 in aerobic operation and 184 in anaerobic operation, and the disk rotation speed was constant at 13 rpm. The processing amount is 60/hour, half of which is 30
In an operation in which /H was circulated to the anaerobic tank and lime was added to the effluent, a BOD removal rate of 90% and a T-P removal rate of 90% or more were obtained. In this case, the BOD of the inflow sewage is 51 to 233 mg/T-P is 6.7 to 11.0
mg/. Approximately 300 mg of lime was added as CaO, but since this was added to half of the total amount processed, the amount used was reduced by half compared to the conventional method.
実施例 ２
実施例１と同じ下水を対象とし、同じ回転円板
装置を使用してリンと同時に窒素除去のテストを
行つた。処理量を40／Ｈとし、このうち半分の
20／Ｈを嫌気槽に循環して、その流出液に石灰
を添加する運転においてBOD、Ｔ−Ｐ、NH4−
Ｎのそれぞれの除去率は90％以上の結果が得られ
た。ただしNOx−Ｎは処理水中に流入NH4−Ｎ
濃度の約50％は残存した。この場合の流入下水の
BODは51〜233mg／、Ｔ−Ｐは6.7〜11.0mg／
、NH4−Ｎは16.2〜28.4mg／である。石灰は
CaOで約300mg／添加したが、これは全処理量
の半分量に対して加えたため使用量は従来法に比
して半分に低減された。Example 2 A test was conducted on the same sewage as in Example 1, using the same rotating disk device to remove phosphorus and nitrogen at the same time. The processing amount is 40/hour, half of which is
In an operation in which 20/H is circulated to an anaerobic tank and lime is added to the effluent, BOD, T-P, NH4
Results showed that the removal rate of each of N was 90% or more. However, NOx-N flows into the treated water as NH 4 -N.
Approximately 50% of the concentration remained. Inflow sewage in this case
BOD is 51-233mg/, T-P is 6.7-11.0mg/
, NH4 -N is 16.2 to 28.4 mg/. lime is
Approximately 300 mg of CaO was added, but since this was added to half of the total amount processed, the amount used was reduced to half compared to the conventional method.
第１図は本発明に使用する回転円板槽の１例の
断面図であり、回転円板体を半水没で使用する場
合と全水没で使用する場合を示す。第２図、第３
図は本発明方法のフローの１例で、適当な時間を
置いて第２図から第３図に切り換え交互に運転す
る。
主要なる部分を表す符号の説明：１：No.１回転
円板槽、２：沈殿槽、３：流出液の１部、４：No.
２回転円板槽、５：凝集槽、６：処理液の１部、
Ａ：回転円板槽、Ｂ：回転円板体、Ｃ：駆動装
置、Ｄ，Ｅ：水位。
FIG. 1 is a cross-sectional view of one example of a rotating disk tank used in the present invention, showing cases in which the rotating disk body is used partially submerged in water and cases in which it is used fully submerged in water. Figures 2 and 3
The figure shows an example of the flow of the method of the present invention, in which the process is switched from Fig. 2 to Fig. 3 at appropriate intervals and is operated alternately. Explanation of the symbols representing the main parts: 1: No. 1 rotating disk tank, 2: Sedimentation tank, 3: Part of the effluent, 4: No.
2 rotating disk tank, 5: agglomeration tank, 6: 1 part of treatment liquid,
A: Rotating disk tank, B: Rotating disk body, C: Drive device, D, E: Water level.
Claims (1)
板体の一部及び全体を随時水没させることができ
る構造とした回転円板槽を２槽以上設置し、一系
統では回転円板槽の水位を回転円板体の一部を水
没させる状態で運転し、有機物とリンを含む廃水
を導いて、好気的に有機物とリンを除去し、他の
系統では回転円板槽の水位を回転円板体の全体を
水没させる状態で嫌気的に運転し、前記好気処理
を行つた処理水の一部を後者の嫌気性槽に導い
て、嫌気的運転を行い、活性汚泥膜中のリンを放
出させた後、この放出されたリンを凝集沈殿によ
つて除去する二系統からなる装置で、二系統間で
交互に運転を切換えることによつて連続的に有機
物及びリンを除去する廃水処理方法。 ２ 槽内の水位を変化させることにより、回転円
板体の一部及び全体を随時水没させることができ
る構造とした回転円板槽を２槽以上設置し、一系
統では回転円板槽の水位を回転円板体の一部を水
没させる状態で運転し、有機物とリンと窒素を含
む廃水を導いて、好気的に有機物とリンの除去及
び窒素分の硝化を行い、他の系統では回転円板槽
の水位を回転円板体の全体を水没させる状態で運
転し、前記好気処理を行つた処理水の一部を後者
の嫌気性槽に導いて、嫌気的運転を行い、窒素酸
化物の脱窒処理及び活性汚泥膜中のリンの放出を
行い、この放出されたリンを凝集沈殿によつて除
去する二系統からなる装置で、二系統間で交互に
運転を切換えることによつて、連続的に有機物、
リン及び窒素を除去する廃水処理方法。[Scope of Claims] 1. Two or more rotating disk tanks are installed with a structure that allows the rotating disk body to be submerged partially or completely at any time by changing the water level in the tank, and one system is The water level in the rotating disk tank is adjusted so that a part of the rotating disk body is submerged, and the wastewater containing organic matter and phosphorus is guided to remove organic matter and phosphorus aerobically. Anaerobic operation is performed with the water level of the tank submerged in the entire rotating disk body, and a portion of the treated water that has been subjected to the aerobic treatment is guided to the latter anaerobic tank to perform anaerobic operation and activate the water. This is a two-system device that releases phosphorus from the sludge film and then removes the released phosphorus through coagulation and sedimentation.It continuously removes organic matter and phosphorus by alternating operation between the two systems. A wastewater treatment method that removes. 2 Two or more rotating disk tanks are installed with a structure that allows the rotating disk body to be submerged partially or completely at any time by changing the water level in the tank, and in one system, the water level of the rotating disk tank is The system is operated with a part of the rotating disk body submerged in water, and the wastewater containing organic matter, phosphorus, and nitrogen is guided, and the organic matter and phosphorus are removed aerobically and the nitrogen content is nitrified. The water level of the disc tank is set so that the entire rotating disc body is submerged in water, and a part of the treated water that has been subjected to the aerobic treatment is guided to the latter anaerobic tank to perform anaerobic operation and perform nitrogen oxidation. A device consisting of two systems that denitrifies substances and releases phosphorus in activated sludge membranes, and removes the released phosphorus by coagulation and sedimentation. , continuous organic matter,
A wastewater treatment method that removes phosphorus and nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56184418A JPS5888093A (en) | 1981-11-19 | 1981-11-19 | Purfication of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56184418A JPS5888093A (en) | 1981-11-19 | 1981-11-19 | Purfication of waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5888093A JPS5888093A (en) | 1983-05-26 |
| JPH02116B2 true JPH02116B2 (en) | 1990-01-05 |
Family
ID=16152812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56184418A Granted JPS5888093A (en) | 1981-11-19 | 1981-11-19 | Purfication of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5888093A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62106897A (en) * | 1984-07-09 | 1987-05-18 | シラキユ−ス ユニバ−シテイ | Device and method of treating waste water |
| KR19990073490A (en) * | 1999-07-13 | 1999-10-05 | 이영호 | Wastewater Treatment Apparatus and Method Using Rotating Biofilm Contact Tube Reactor |
| JP3356764B2 (en) | 2001-02-13 | 2002-12-16 | 日本ベルボン精機工業株式会社 | Telescopic device |
| CN103523904B (en) * | 2013-09-29 | 2015-04-22 | 北京桑德环境工程有限公司 | Liquid level adjustable type biological rotating disc system |
-
1981
- 1981-11-19 JP JP56184418A patent/JPS5888093A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5888093A (en) | 1983-05-26 |
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